OFFSET
1,3
COMMENTS
1976! + 1976!! + 1 is a 5657-digit prime. Next term is greater than 4000.
LINKS
EXAMPLE
6! + 6!! + 1 = 769, which is prime.
CROSSREFS
KEYWORD
hard,more,nonn
AUTHOR
Giovanni Resta, Mar 04 2006
EXTENSIONS
5126 from Herman Jamke (hermanjamke(AT)fastmail.fm), Jan 03 2008
STATUS
approved